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For the purpose of supporting Voice over IP applications with performances similar to the classic telephony, the IP infrastructure must ensure smooth delivery of the voice and signaling packets to the VoIP elements. Although network failures are rare, planning for them is essential. Failover strategies are desirable for cases when network devices malfunction or links are broken. An important strategy is to deploy redundant links between network devices and/or to deploy redundant equipment. To ensure continued service, organizations should plan carefully for how media gateways and media gateway controllers can make use of the redundant schemes. The requirements for VoIP communications pushed the vendors of network equipments to offer new features in the area of network availability.
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